Friction window sash mounting



June 30, 1942. F. N. vosr-z FRICTION WINDOW SA SH MOUNTING Filed Nov;28, 1939 Patented June 30, 1942 assess:

T OFFICE rarcrros wmnow sasn MOUN'IJNG Fred N. Vole, some .Maine,auignor 'to' Mathews Brother Co ration of Maine .,Beifast,Maine,aeorpo-'Application November as, me, Serial No. seem a Claims. 20-52) Thisinvention relates to windowconstruction wherein the sashes are heldfrictionaily instead of being counterbalanced. For this purpose thewindow casing is provided with sash-engaging strips pressed intofrictional engagement with the edges of the sashes. The heavier the sashfor a given length of engaging strip contacted. or the shorter theengaging strip contact for a given weight of sash, the greater is thefrictional pressure required to maintain the sash in lifted position.but a pressure greater than necessary to hold thesashinanypositioninwhichitmaybe placed is not desirable since it adds totheeffort necessary to move the sash. -IBieretofore it has been theusual practice to provide for the pressure required in a y particularinstallation by selection of the sizeand stiffness of the springs whichhave been employed to press the friction strips against the sashes. Thismethod is largely a matter of guess work and many times requires trialand change for reasonably satisfactory operation. 7

An object of the present invention, therefore, is to provide-foradjustability of the spring pressure in such a manner that theadjustment may be made'after assembly of all the parts and in accordancewith the individual requirement of each sash.

A further object is to provide for such adjustment which shall beeffective over a substantial length of the friction strip. rather thanmerely locally, so that the effects on the sash may be made readilysubstantially uniform throughout the range of motion of the sash.

For a more complete understanding of this in-- vention, reference may behad to the accompanying drawing in which- Figure 1 is a vertical sectionthrough a window frame and related parts showing upper and lower sashestherein. this structure embodying the invention.

Figures zand 3 are detail sections to a larger scale on section lines2-4 and 3-4. respectively, of Figure 1.

Figure 4 is a detail section on line 4-4 of Figure 3.

Figure 5 is aviewsimilar to aportionofFigure 3, but illustratingadjustment of the frictional pressure on a window sash.

Referring to the drawing, at l and 2 are indicated the upper and lowersashes of a window which sashes are slidable within the sash guides 3and 4, respectively. As shown, the sash guides are formed inpart by ametallic strip I having a central sash separator portion 6 which may beof and engages within a shallow rounded channelltintheedgeportionofthesash.'lhesemembersiiaresprlngpressedagainsttheedsesofthe sash and preferablyextend the full lengths of thesashguidesinordertoactnotcnlyasfrictionelements for retainingthesashesinanypo- 'sitionsofslidingadjustment,butalsotoactas sashesfrom weather strips, sealing the frame and passageof. air therepast.

Each of the strip members I! is shown as secured asat oppositeendswithintheframere 'cesses llLandforthispurpoualightcoilspring H has beenillustrated, one end portion I! of which may be extended through aperforation it in the lining part 8, the opposite endof eachof thesespringsbeingextendedthroughahole It in thestrip portion l5 and hookedthereover as shownbestinFigure-i. Thesesm'in'gsactto retain the frictionmembers within their recesses withpossibility of yielding to an extentsufficient to insure engagement of the strip members on the sashes.These strip members are pressed outwardly against the sashes by theadjustable springmeansshownbestinFigures3and5. Such a spring membercomprises a leaf spring 20, opposite end portions of which are curved asat 2| and bear against one part, shown as the back face of the socket orthe lining for this socket. Between theseeend portions 2| an the centralportion 22. each spring member has an outwardly extending portion 23which bears against he otherpart. shownastheback faceofthefriction stripmember IS, the two portions 2| and 23 on each side of the central partof the spring acting to press the friction strip i5 outwardly. Theextent of this outward presure may be regulated asby turning the screw25, whichhasahead 26 positioned in a depression 21 in the outer face ofthe friction strip l5, this screw enga ing in a threaded opening 2| of anut member a which maybesecuredto orbeintegralwiththes'pring 20. Asshown this nut member "is of rectangularshapesoastobeheldfromrotationwith the screw. should it not be secured to the spring 20, byengagement with the opposite sides or the strip i5 within which it maybe housed. By turning thescrew 25 in arnanneriobrlng the central portionof the spring '20 outwardly. the portions 23 and 2i are pressed withgreater force between theinnerface oithestrip I andthebackoi'the socketor the lining 10, to exert an increased effect to press the strip [5 outfrom its recess and into tighter frictional engagement with the edge atthe sash contacted thereby. It will be noted that the head 26 of thescrew is accessible on the inner face of the friction strip so that theadiustment of the spring tension may be made while the sash is inposition. It may thus be adjusted to the conditions of the installationwith respect to the length of the contact between the frictionstnpandthesasnandtheweightoithesashso that an accurate adjustment suitedto the exact conditions of operation may be readily eiiected. It will benoted, also, that the adjustment is effective on the friction strip attwo points spaced considerably from each other. Thus an adjustment overan extended length or the friction strip is produced instead of theeiiect being localized. For all but the very short sashes, ordinarilytwo oitheseadjustmentsprlngswillbeallthatis necessary for each frictionstrip, though for extremely high sashes, three may be used. Because oithe extended area over which adjustment takes place, however, it is arelatively easy matter to provide for the desired frictional engagementof the sash substantially uniiormly throughout its range of movement, sothat the sash will remain in any position inwhich it is placed and yetwfll not slide too hard in any portion oi. its path.

In order to further provide for electing weather stripping of thesashes, their parting strips 30 and 3| may be provided withinter-engaging weather strips 32 and 33, respectively, and suitableweather strips such as 34 and 36 may be provided for the lower edge ofthe inside sash and the top edge of the outside sash.

From the foregoing description 01' an embodiment or this invention, itshould be evident to those skilled in the art that various changes andmodifications might be made without departing from the spirit or scopeof this invention as defined by the appended claims.

I claim:

1. The combination with a window frame having a sash guide, and a recessextending lengthwise within said sash guide, of a generally U shapedsash-engaging member seated in said recess, a leaf spring between thesides of said member and having end portions engaging the base of saidrecess and portions between said end portions and central portion forengagement with the back face of said sash-engaging member, and meansengageable with the central portion of said spring and saidsash-engaging member and accessible irom the sash-engaging face of saidmember for adjusting said central portion toward and from the base 01said recess, thereby adjusting the pressure or said spring acting topush said member against the edge of a sash movable in said sash guide.

2. The combination with a window frame having a sash guide, and a recessextending lengthwise within said sash guide, of a generally U shapedsash-engaging member seated in said recess, a lea! spring between thesides of said member and having end portions engaging the base of saidrecess and portions between said end portions and central portion forengagement with the back race of said sash-engaging member, the centralportion of said spring being bowed away irom said sash eng member andhaving a threaded part operatively related thereto, and a screw engagingin said threaded part and having a head accessible from thesash-engaging face of said'member.

FRED N. VOSE.

CERTIFICATE OF CORRECTION. Patent No. 2,288,558. June 50, 19!;2.

' FRED N. VOSE.

It is herehy certified that the name of the assignee in the abovenumbered patent was erroneously described and specified as "MathewsBrother C0." Whereas ssid name should have been described and specifiedas "Mathews Brothers C0,; and that the said Letters Patent should beread with this correction therein that the same may conform to therecord of the me in the Patent Office.

Signed and sealed this hth day of August, A. D. 19L 2.

Henry Van Arsdle, (Seal) Acting Commissioner of Patents.

